A10VSO18DR/31R-PPA12NOO A10VSO Series Swashplate Axial Piston Variable Pump

Hengmeisi, a trusted China factory and global supplier specializing in A10VSO18DR/31R-PPA12NOO A10VSO Series Swashplate Axial Piston Variable Pump, independently develops and produces the A10VSO18DR/31R-PPA12NOO to meet the market demand for small-flow, high-precision and energy-saving hydraulic power units. The A10VSO18DR/31R-PPA12NOO is a classic micro-displacement variable pump in the 31R generation A10VSO product lineup, adopting swashplate axial piston working principle that differs completely from bent-axis piston pumps. It focuses on light-load, frequent start-stop and precision pressure-maintaining working scenarios, making up for the shortcomings of large energy consumption and excessive flow surplus of large-displacement pumps in small hydraulic systems.

The A10VSO18DR/31R-PPA12NOO features a nominal displacement of 18mL/r, belonging to the mainstream micro-displacement specification for precision industrial hydraulics. With a rated working pressure of 315bar and a peak pressure of 350bar, it balances pressure resistance and operational flexibility perfectly. Equipped with DR hydraulic constant pressure control system, the pump can automatically maintain stable system pressure by real-time hydraulic feedback, eliminating frequent pressure fluctuations during equipment operation. The optimized 31R internal structure reduces overall weight and rotational inertia, achieving faster response speed and lower operational noise compared with old-generation models. The unique through-shaft design supports multi-pump series connection, enabling integrated modular hydraulic system configuration and greatly improving equipment layout flexibility.

In terms of structural stability and compatibility, the durable A10VSO18DR/31R-PPA12NOO A10VSO Series Swashplate Axial Piston Variable Pump adopts standardized PPA12NOO assembly and sealing configuration, with dual oil drain ports and optimized internal flow channel layout. This design effectively reduces internal heat generation and oil suction resistance, improving volumetric efficiency up to 92.5% while lowering system temperature rise. The precision-machined swashplate and piston friction pair minimize wear loss during long-term reciprocating operation, ensuring stable flow and pressure output consistency. All installation flanges, shaft diameters and oil port positions comply with SAE international standards, realizing full interchangeability with original parts. Users can directly replace old and aging pumps without modifying pipeline layout and control programs, greatly reducing equipment maintenance downtime and renovation costs.

Core Product Advantages

1. Classic DR Hydraulic Constant Pressure Control

The A10VSO18DR/31R-PPA12NOO adopts mature DR pure mechanical constant pressure control technology, one of the most stable control modes for industrial open-circuit hydraulic systems. Without relying on electronic signals or electrical control modules, the pump automatically adjusts displacement and flow according to real-time system pressure changes. When the system reaches the preset pressure value, it automatically reduces displacement to maintain constant pressure and reduce idle power loss; when the pressure drops due to load increase, it instantly increases flow supplementation to stabilize working pressure. This passive hydraulic regulation features ultra-fast response, strong anti-interference ability and zero electronic failure risk, ensuring stable operation in complex industrial environments with unstable power supply and severe signal interference.

2. 18cc Micro Displacement & High Energy-saving Performance

Designed for precision small-flow hydraulic systems, the A10VSO18DR/31R-PPA12NOO features an 18mL/r small displacement that perfectly matches the power demand of light industrial equipment. Compared with medium and large-displacement pumps, it avoids excessive flow output and invalid energy consumption, significantly improving equipment energy-saving efficiency during low-load and pressure-maintaining operation. The low-inertia swashplate structure enables sensitive and accurate displacement adjustment, effectively suppressing system pressure overshoot and flow pulsation. It ensures precise and stable action output of hydraulic cylinders and hydraulic motors, greatly improving the machining accuracy and operational stability of automated hydraulic equipment.

3. 31R Upgraded Lightweight & Through-shaft Structure

The 31R upgraded structural design is a core optimization highlight of the A10VSO18DR/31R-PPA12NOO. Compared with old 20/25 series structures, the 31R version optimizes internal component layout, reduces overall pump weight and volume, and improves power density. The standardized through-drive shaft design supports multi-pump tandem installation, allowing users to assemble multiple hydraulic pumps on one drive source to form multi-circuit hydraulic systems, which is very suitable for integrated and compact automated equipment layout. The upgraded bearing system improves low-speed operational stability, effectively avoiding jitter and pressure fluctuation during equipment low-load creeping operation, and extending the service life of friction pairs.

4. PPA12NOO Standard Sealing & Wide Environmental Adaptability

Equipped with classic PPA12NOO standardized sealing and protection configuration, the A10VSO18DR/31R-PPA12NOO adopts high-quality NBR and PTFE composite sealing materials, featuring excellent oil resistance, aging resistance and medium-pressure leakage prevention performance. It stably adapts to a working temperature range of -25℃ to +110℃, meeting the long-term continuous operation requirements of indoor industrial workshops and light outdoor working conditions. The dual oil drain port design accelerates internal hot oil circulation, reduces pump body temperature rise, and avoids thermal attenuation failure caused by long-term continuous operation. The integral anti-rust shell coating improves dust-proof and anti-corrosion capability, ensuring low failure rate and high stability of long-cycle industrial production.

Model Code Detailed Explanation

Each code of A10VSO18DR/31R-PPA12NOO accurately defines the structural type, displacement, control mode, structural version and sealing configuration, facilitating quick model selection and precise system matching for global industrial buyers:

Product Structure & Manufacturing Technology

1. High-precision Swashplate Variable Structure

Different from bent-axis piston transmission, the A10VSO18DR/31R-PPA12NOO adopts a mature swashplate inclined piston transmission principle. The rotating drive shaft drives the piston group for reciprocating linear motion, and the stepless adjustment of swashplate angle changes the piston stroke to realize variable flow output. The symmetrically arranged seven-piston structure ensures uniform oil suction and discharge, effectively reducing flow pulsation and operational vibration. All piston and cylinder block matching surfaces are processed by micron-level precision grinding, with ultra-low matching gaps, minimizing internal leakage and ensuring high volumetric efficiency and stable pressure holding performance.

2. Light-duty High-precision Wear-resistant Materials

Core moving parts of the A10VSO18DR/31R-PPA12NOO are made of high-strength wear-resistant alloy steel, treated with carburizing quenching and precision polishing to obtain balanced hardness and toughness. The swashplate surface is coated with anti-wear protective layer to reduce friction loss during frequent angle adjustment. The lightweight cast aluminum alloy shell reduces overall equipment load while ensuring structural rigidity. The matched high-precision rolling bearings feature low friction coefficient and sensitive rotation, ensuring flexible response during frequent start-stop and variable speed operation of industrial equipment.

3. Heat Dissipation & Stable Pressure Holding System

The dual oil drain port design of the A10VSO18DR/31R-PPA12NOO forms a efficient internal circulation heat dissipation system, which can timely discharge hot oil inside the pump body, avoid local overheating and oil deterioration, and maintain long-term operational stability. The built-in DR pressure feedback valve group features high-precision pressure sensing and rapid adjustment capability, which can dynamically balance system pressure and eliminate pressure deviation caused by load changes. The simplified internal pipeline structure reduces pressure loss and leakage points, improving the overall working efficiency and pressure holding accuracy of the hydraulic system.

Application Scope

With its compact structure, precise constant pressure performance, sensitive response and low energy consumption, the A10VSO18DR/31R-PPA12NOO A10VSO series hydraulic pump is widely used in various light industrial and precision hydraulic fields. It serves as the core power unit for automated hydraulic production lines, small hydraulic press equipment, hydraulic lifting platforms and precision testing hydraulic stations. In the mechanical supporting field, it is applicable to auxiliary hydraulic systems of small excavators, road maintenance machinery and light engineering equipment. In addition, it is also widely matched with packaging machinery, injection molding auxiliary hydraulic systems and general industrial hydraulic equipment, providing stable, energy-saving and high-precision hydraulic power guarantee for various light-load and precision operation scenarios.

As a professional China manufacturer and supplier focusing on A10VSO series industrial hydraulic pumps, Hengmeisi implements strict full-process quality control. Every A10VSO18DR/31R-PPA12NOO pump undergoes precision pressure calibration, flow stability test and long-term aging test before delivery, ensuring qualified performance and high interchangeability with original parts. With stable quality, competitive factory price and reliable after-sales service, our products have become the preferred replacement and supporting hydraulic components for global industrial equipment manufacturers and mechanical maintenance enterprises.